diff --git a/bpftool/src/skeleton/pid_iter.bpf.c b/bpftool/src/skeleton/pid_iter.bpf.c
index 3876e01c6ec07af2d3d589d315bb3540f66a963c..a077dc6d5d7348cafeb1ce0cddb4ef23c3c1384d 100755
--- a/bpftool/src/skeleton/pid_iter.bpf.c
+++ b/bpftool/src/skeleton/pid_iter.bpf.c
@@ -21,3 +21,30 @@ extern const void bpf_prog_fops __ksym;
 extern const void btf_fops __ksym;
 
 const volatile enum bpf_obj_type obj_type = BPF_OBJ_UNKNOWN;
+
+static __always_inline __u32 get_obj_id(void *ent, enum bpf_obj_type type)
+{
+	switch (type) {
+	case BPF_OBJ_PROG:
+		return BPF_CORE_READ((struct bpf_prog *)ent, aux, id);
+	case BPF_OBJ_MAP:
+		return BPF_CORE_READ((struct bpf_map *)ent, id);
+	case BPF_OBJ_BTF:
+		return BPF_CORE_READ((struct btf *)ent, id);
+	case BPF_OBJ_LINK:
+		return BPF_CORE_READ((struct bpf_link *)ent, id);
+	default:
+		return 0;
+	}
+}
+
+/* could be used only with BPF_LINK_TYPE_PERF_EVENT links */
+static __u64 get_bpf_cookie(struct bpf_link *link)
+{
+	struct bpf_perf_link *perf_link;
+	struct perf_event *event;
+
+	perf_link = container_of(link, struct bpf_perf_link, link);
+	event = BPF_CORE_READ(perf_link, perf_file, private_data);
+	return BPF_CORE_READ(event, bpf_cookie);
+}